Poor nutrition, mental stress, fatigue, other diseases, cold, etc. can lead to a decrease in body resistance and a weakened ability to fight infection on the one hand, and can promote dysbiosis on the other. Mothers with sunken or flat nipples, chronic inflammation of the milk ducts, too much milk or too little breastfeeding, lack of attention to local cleansing of the nipple areola, previous history of mastitis, trauma to the breast, or incorrect nipple-holding posture or incorrect breast leaving, etc. can easily cause acute mastitis during breastfeeding.